System of control for electric elevators



1933. J. PEDERSEN 1,920,590

SYSTEM OF CONTROL FOR ELECTRIC ELEVATORS Filed Feb. 2, 1931 2 Sheets-Sheet 1 j K vL Z 22? Hit %l f' I 2 A- 30 Z8 HA ,7 r

24- k. 2 4 1 J; 77- V E 3/ MJJ J) 1 xi ff 3/ F W )A \V m E .a Z Inuenior W e70/222 fieaflwws'eza A Home y Aug. 1, 1933. J PEDERSEN 1,920,590

SYSTEM OF CONTROL FOR ELECTRIC ELEVATORS Filed Feb. 2, 1951 2 Sheets-Sheet 2 Jzz Few/6192a A Ilorncy Patented Aug. 1, 1933 sYs'rEMoF' oon'moi. FOR ELECTRIC ELEVATORS Jami Pear en, St. Louis, Mo. I .ApplicationFebruary 2,1931. Serial No. 512,970 I i 2 claims, ,(c1.1s.7--29) tor car in stopping to effect an exact landing thus overcoming the necessity of what is commonly termed in the art an inching operation to bring the car exactlylevel with the landing.

The invention will be best understood from a stud of the following description, taken in connection with the accompanying drawings wherein: i

Figure 1 is a longitudinal sectional elevational view through an elevator shaft illustrating somewhat diagrammatically the control system comprehended by the present invention.

Figure 2 is a fragmentary elevational view of a fifth rail and conduit forming part of the invention.

Figure 3 is a horizontal sectional elevational view of the elevator cage in top plan.

Figure 4 is a fragmentary sectional elevational view illustrating the electro-magnet, plunger rod r and a portion of the fifth rail and clearlyv illustrating the relative position of the parts when the magnet is de-energized. I

Referring more in detail to the drawings, it will be seen that A designates the several floors or buildings, B the elevator shaft and the elevator car being designated generally by the reference character C.

On one wall of the elevator shaft B is a bracket plate 1 and a vertically disposed guide rail for the elevator is secured in position through the medium of clips 3 engaging the guide rails 2 and bolted to the plate 1 asat 4. The elevator car shoes that cooperate with the guide rail 2 are designated by the reference character 5.

Suitably bolted or otherwise secured as at 6 to the top of the car structure is a plate '7. Bolted on the plate 7 adjacent one end thereof as at 8 is a relatively narrow transverse plate 9. Rising from plate 9 is a supporting standard 10 that has secured thereto as at 11 the coil 12 of an electro-magnet 13.

A supporting standard 16 also rises from plate 9, and standard 16 is provided with a horizontal non-circular bore 17 for slidably accommodating a non-circular plunger rod 18. Plunger rod 18 at one end thereof is provided with an integral disk head 19 adapted to be attracted by the magnet 13 when the latter is energized for drawing the plunger rod 18 toward the magnet as is apparent.

lated from the plunger rod 18 as at 22. Suitably At its free end plunger rod 18 is provided with an axial socket for accommodating the shank of a fork 20. vThe shank of the fork 20 is keyed within the sprocket as-at2l and the fork is insujournalied in the fork 20 is a roller 23. Roller 23 and fork 20 are or condutcive material and current to. the fork 20 is continually supplied thereto in a manner hereinafter fully set forth.

An elongated contact member or rail 25 com prises a vertical channel bar anchored toplate 1 as at 26. Arranged Within the channel of the bar is a conductor strip insulated from the bar as at 27. I

The conductor strip referred to comprises a plurality of pairs of bars 23, the same being ofbrass or any other suitableconductive material. There is a pair of such bars 28 between the landing of adjacent floors A and the. bars 28 of the respective pairs are separated by insulation bars 29. The bars 28 of-eachvpair of bars are separated from the bars of adjacent pairs bya relatively short strip of insulation 30. The insulation strips or bars30 are thus disposed one opposite each landing as shown in Figure 1.

Conductors 31, 32 are suitably arranged .in a conduit tube 33 extending parallel to the rail 25. The conduit 33 adjacent each insulated'bar 30 is provided with a box 34. Between each box 34 and an adjacent side of the rail 25is a-nipple 35 through which the branch wires 3.1a, 32a'of the wires 31,32 are passed to be electrically connected with the conductors bars 28. (See Fig-. ure 2.)

In accordance with the present invention, it

'will be seen that when'the car switch 43 actuated forupward movement of carC, a circuit is. established for the operating coil of switch 39 through. the line conductor 40, conductor 14,

coil 12, conductor 15, contact 43 switch segment 43b, contact 430, conductor 310, operating coil of switch 39, conductor 39 and line conductor 42 thus energizing the coil of said switch 39. With the up switch thus closed, the circuit to the motor M will be through the conduit 41, closed con- 10o tact coil 39, conductor 44, and partly through conductor 42 and also partly through conductor 44" through coil 39 and line conductor 40 for causing upward movement'of the elevator car C.

It will thus be seen that with switch 39 closed 195 for causing upward movement of car C the circuit to coil 12 is closed to thereby retain roller 23 out of engagement with rail 25.

Whether the car switch be in either on or off position current is supplied to roller 23 ment 43b is moved out of engagement with contacts 43c, 43c to interrupt the circuit previously traced through the operating coil of the switch 39 and also the circuit previously traced to coil 12 of the electric magnet 13 whereupon roller 23, under action of spring 36, will move into engagement with rail 25.

Assuming that the car C tends to stop below the level'oi the landing, roller 23 will engage a contact 28 located immediately below that short insulated strip 30:nearest to the .top of the car C, whereupon a circuit will be established through line conductor 31, switch 39, conductor 24, branch 31a connected to the particularly referred to strip 28, conductors 31, 31b, 31c operating coil of switch 39, conductor 44, motor M to conductor 42, whereupon switch 39 will be closed and the car C moved upwardly until roller 23 engages the particularly and previously referred to insulating strip 30, when the circuit just traced is interrupted and the car then stopped level with the desired landing.

As is thought apparent, if car C tends to stop abovethe-desired landing, roller 23 will engage the strip 23 immediately above that insulated strip 30 nearest to the top of the car whereupon a circuit is established through line conductor 41, conductor 24, branch 32a connected to the just previously mentioned strip 28, conductors 32, 32b, 32c, operating coil of switch 38, conductor 44", motor M, switch 38, to line conductor 40, with 1 the result that switch 38 will be closed and the car 0 moved downwardly-until roller 23 engages the above mentioned insulating strip 30, interrupting the circuit just traced through switch 38, causing the car to stop level with the landing.

Itwill be apparent that the car switch 43-may be actuated to the down position in the usual manner and to thereby engage switch segment 4:31) with the contact 43a, s3?) and eiiect a closure of the switch 38' and the operation of the car to any of the lower landings.

It should be noted that in its running positions the car switch maintains an uninterrupted circuit through coil-12 of magnet 13 since one side of the coil is'electrically connected to switch contacts 43d, 43c, and the other side of the coil 12 is electrically connected to both of the switches 38 and-'39; and also that a continuous current supply-for roller 23 is provided since the same is fed from the same line wire that leads to the car switch 43.

Even though I have herein shown and described the preferred embodiment of the invention, it is to be understood that the same is susceptible of changes, modifications and improvements coming within the scope of the appended claims.

Having thus described my invention what I claim as new is:

1. In an elevator, the combination of a car, an electric hoisting motor mechanism,'a controller therefor including a car switch, direction switches and a car position controlled means to close the proper direction switch ,to level the car with a' landing whether the car over-runs or under-runs the'landing when the car switch is centered to the off position; said car switch, direction switches and position controlled means being in the circuit of the motor mechanism; and

said position controlled means including elon- Lgated contacts arranged above and below the ward and away fromlsaid contacts and insulating sections and electrically operable means for shifting said contact arranged in circuit with the direction switches and controlled thereby to release the shiftable contact when the car switch is centered to the oii position. 1 I

' 2. in an electric elevator, the combination with the hoisting motor and car switch in circuit with the hoisting motor, of means in said circuit for supplying current to the motor to automatically level the car Jith a-landing when the car switch is'in off positicn, and comprising direc tion switches normally open when the car switch is in oif position, car positioned controlled means toclose the proper direction switch when the car overruns or ,underruns the desired landing and the car switch is in oi'f position, to

thereby close the circuit to said direction switch and level the car with the landing, said car position controlled means comprising contact strips disposed parallel to the path of the car and arranged in pairs above and below the landingand a cooperating contact shiftably' mounted on the car; a relatively elongated insulating section arment with said contact strips when the car is under'the control of the car switch.

I v JOHN PEDERSEN. 

